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題名 | 應用植生指標萃取淹水區位曼寧粗糙係數之研究=Application of Vegetation Index to Extract the Spatial Distribution of Manning's Roughness Coefficient for Inundation Simulation |
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作者 | 林昭遠; 陳禹成; 莊智瑋; Lin, Chao-yuan; Chen, Yu-cheng; Chuang, Chin-wei; |
期刊 | 水土保持學報 |
出版日期 | 20090600 |
卷期 | 41:2 2009.06[民98.06] |
頁次 | 頁181-195 |
分類號 | 434.273 |
語文 | chi |
關鍵詞 | 淹水模擬; 曼寧粗糙係數; 植生指標; FLO-2D; Inundation simulation; Manning's n value; Vegetation index; |
中文摘要 | 利用淹水模式推估淹水範圍與水深已相當普及。淹水模擬演算中,淹水區位曼寧粗糙係數 之空間分布顯著的影響模擬結果。傳統上多以土地利用為基準,由手冊或前人研究資訊給予適 當的曼寧粗糙係數,但地覆之曼寧粗糙係數變異極大,如何客觀地直接由遙測影像萃取植生指 標轉換成曼寧粗糙係數供淹水模擬之演算乃極為重要。本研究運用SPOT 衛星影像萃取植生指 標配置淹水區位之曼寧粗糙係數,以FLO-2D 模式模擬成果與傳統之土地利用配置方式進行比 較,分析淹水範圍及深度,結果顯示以植生指標配置方式與土地利用配置方式差異不大,其中 以「乘冪配置」之處理較佳,範圍相似率為98.2%,水深相對誤差為7.8%。研究結果顯示應用 植生指標可有效地萃取淹水區位之曼寧粗糙係數供淹水模擬之用。 |
英文摘要 | It has already been very popular nowadays to use the models for simulating the inundation area and water depth. The spatial distribution of Manning’s roughness coefficient (Manning’s n value) at the inundation areas significantly affects the results of simulation. Traditionally, the proper Manning’s n value for a given area is directly derived from land use data recommended by the user manual and/or the previous studies. Due to highly variations in the spatial distribution of Manning’s n value and how to objectively obtain the values, it plays an important role to extract the spatial distribution of Manning’s n value from the satellite imagery. This study focuses on the possibility of extracting the Manning’s n values from the vegetation index, which are calculated from the remote sensed imagery, for simulating the inundation areas in holun river watershed by using FLO-2D model. Results show that there is no significant difference between the treatment of vegetation index and land use according to the area and depth of inundation. The treatment of power regression with a 98.2% similarity in inundation area and 7.8% relative error in inundation depth, compared with the traditional method (allocation by land use), has the better outcome. Vegetation index calculated from satellite imagery can be applied to extract the spatial distribution of Manning’s n value for the use of inundation simulation. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。